Pollensa : Shutter/Fly Screen Attachment

The attachment/joining of the shutter and fly screen uses a small thin "tensioned/bent" piece of metal, no larger than a postage stamp. One of mine sprang out and I'm finding it difficult to get it to stay properly in place. I suspect that it is now "tensioned/bent" differently to the norm! Has anyone else encountered this problem? Is it a part that can be easily sourced?

Many thanks in anticipation.

 Martin